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Newer model is supposed to make setting temp easier but makes it harder because when you try to set temp both the temp dial and the indicator arrow turns. You can't just turn the knob a little to increase/decrease the temp, you have to go past the temp you want by several degrees and then come back to the temp you want and since the indicator arrow wants to turn also you loose your place.

New model is fully submersible and once you have the temp set it will hold it steady. The newer design doesn't have the button on the top, it has a red dial with an arrow.

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You're getting old when you get the same sensation from a rocking chair that you once got from a roller coaster.

Basicly gadget228 has said it all, I totally agree. I will only add that the temperature dial is rigid witch makes it hard to turn with wet fingers, meaning with the heater in it's place. Minor problem for most since they run with the same temperature all the time. Besides holding a fairly steady temperature, it warms up the water rather quick. After 20 % water changes with cold water, the temp. goes from 25 degrees to 22 in my tank. I use the 150 watt heater in my 65 gal. tank. And it takes under 2 hours to heat up from 22 back to 25 degrees.
Jäger is good value for the money.

Out of the box set it at 81 Degrees and my 75 Gallon is at and stays at 81 Degrees

Cons:

None

I bought the 200 Watt from Dr's Foster and Smith for $20.99 0n sale, and if you spend $49.00 you get FREE shipping. This is the Best Heater i have ever owned. It heats my 75 Gallon Tank with Ease. Just remember they are BIG heaters the 200 watt is 15 Inches Long.

Gas mileage isn't everythingOIIIIIIIOLack of planning on your part does not constitute an emergency on my part.Why pretend there are no stupid questions? Actually, There are many stupid questions: "Should I drink this bleach?" Is just one example.
Having said that, Just because it's a stupid question doesn't mean that it shouldn't be asked. It's better to know.A warm beer is better than a cold beer. Because nothing is better than a cold beer, and a warm beer is better than nothing.

I bought this to replace another heater that was malfunctioning/not keeping temperature well. Other than the difficulty of getting the dial to turn (much harder than other models I've used), I'm quite pleased. Great value!